Created
July 24, 2014 10:21
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MySQLでselectした結果があるかどうかをメソッド化し、さらに存在しない組み合わせを作成する
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<?php | |
/* usage: | |
$ php generate_unique_pair.php 3 | |
48881407 24892092 | |
49164657 48309651 | |
43192279 7385075 | |
*/ | |
define('NUM_PAIRS', $argv[1]); | |
define('MAX_USERS', 5000 * 10000); | |
$dbname = 'db01'; | |
$host = 'localhost'; | |
$user = 'root'; | |
$password = 'root'; | |
$table = 't01'; | |
$pairs = array(); | |
$pdo = new PDO( | |
'mysql:dbname=' . $dbname . ';host=' . $host . ';charset=latin1', $user, $password, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_PERSISTENT => true) | |
); | |
while (TRUE) { | |
if (count($pairs) >= NUM_PAIRS) { | |
break; | |
} | |
$userid = rand(1, MAX_USERS); | |
$followerid = rand(1, MAX_USERS); | |
if (select($pdo, $table, $userid, $followerid) === FALSE) { | |
$pairs[] = array($userid, $followerid); | |
} | |
} | |
foreach ($pairs as $pair) { | |
echo $pair[0] . "\t" . $pair[1] . "\n"; | |
} | |
/* $iと$fの組み合わせが存在してればTRUE, 存在しなければFALSE */ | |
function select($pdo, $tablename, $i, $f) { | |
try { | |
$stmt = $pdo->prepare("select f from " . $tablename . " where i = :i and f = :f"); | |
$stmt->bindValue(':i', $i, PDO::PARAM_INT); | |
$stmt->bindValue(':f', $f, PDO::PARAM_INT); | |
$stmt->execute(); | |
$row = $stmt->fetch(PDO::FETCH_ASSOC); | |
if ($row === FALSE) { | |
return FALSE; | |
} | |
return TRUE; | |
} catch (PDOException $e) { | |
die("ERROR. " . $e->getMessage()); | |
} | |
} |
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